A power vibration absorption unit pile for constant frequency vibration isolation

Abstract

The present application relates to the technical field of vibration isolation engineering elements, and particularly relates to a dynamic vibration absorbing unit pile for fixed-frequency vibration isolation. Since the vibration source generated by industrial mechanical equipment is generally low-frequency strong-pulse fixed-frequency vibration, a dynamic vibration absorbing unit pile for fixed-frequency vibration isolation is used in the path of vibration transmission from the vibration source body to the vibration-sensitive target to be protected. The outer tube pile connected by the outer elastic body absorbs the fixed-frequency vibration generated by the vibration source body to produce resonance, and the inner absorbing pile is connected by the inner elastic body inside the outer tube pile. Based on the dynamic vibration absorbing principle, the dynamic vibration absorbing system composed of the inner elastic body and the inner absorbing pile absorbs the resonance energy generated by the outer tube pile, effectively absorbs the fixed-frequency vibration energy transmitted from the vibration source body in the vibration transmission path, and thus the purpose of effective vibration isolation is achieved.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and isolation engineering components, and in particular to a dynamic vibration absorption unit pile for fixed-frequency vibration isolation. Background Technology

[0002] Large industrial equipment, such as large forging machines and reciprocating stone cutting machines, is prone to generating low-frequency vibrations. These low-frequency, high-pulse, fixed-frequency vibrations, propagating through the foundation, can easily cause vibrations in surrounding buildings or other sensitive targets, leading to potential comfort or structural safety hazards. Currently, there are no reasonable and feasible solutions for controlling low-frequency, high-pulse, fixed-frequency vibrations caused by the operation of large industrial equipment. Current measures such as periodic pile planting and trench vibration isolation are limited by the principles of vibration isolation and their feasibility, and cannot effectively isolate or absorb these vibrations. Therefore, it is necessary to adopt new technologies to effectively control the propagation of low-frequency, high-pulse, fixed-frequency vibrations in soil and rock masses. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies in effectively controlling the propagation of low-frequency strong pulse fixed-frequency vibration in rock and soil, and to provide a dynamic vibration absorption unit pile for fixed-frequency vibration isolation.

[0004] This invention provides a dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation, comprising:

[0005] A soil and rock support is installed between the vibration source and the vibration-sensitive target, and is vertically installed in the soil and rock on the side closest to the vibration source.

[0006] The rear support body of the rock and soil is set between the vibration source body and the vibration sensitive target and is vertically set in the rock and soil on the side closer to the vibration sensitive target. The rear support body of the rock and soil is set opposite to the front support body of the rock and soil.

[0007] A vibration resonance amplification system includes an outer elastic body and an outer pipe pile. The outer pipe pile is disposed between the front support body and the rear support body of the soil and rock mass. The outer elastic body is disposed between the outer pipe pile and the front support body of the soil and rock mass, and between the outer pipe pile and the rear support body of the soil and rock mass.

[0008] A dynamic vibration absorption system includes an inner elastic body and an inner layer vibration-absorbing pile. The inner layer vibration-absorbing pile is disposed inside the outer layer pipe pile. The inner elastic body is disposed between the outer wall of the inner layer vibration-absorbing pile and the inner wall of the outer layer pipe pile. The inner elastic body is connected to both the outer wall of the inner layer vibration-absorbing pile and the inner wall of the outer layer pipe pile.

[0009] The fixed-frequency vibration generated by the vibration source body can be transmitted to the outer elastic body through the front support of the rock and soil body, causing the outer elastic body to resonate with the outer layer pipe pile. The vibration generated by the resonance of the outer pipe pile compresses the inner elastic body, causing the inner elastic body to deform and dissipate energy, and then transmits the remaining energy after energy dissipation to the inner layer vibration-absorbing pile for absorption.

[0010] Preferably, the mass ratio of the inner layer vibration-absorbing pile to the outer layer pipe pile is... Less than or equal to 1.

[0011] Preferably, the stiffness value of the external elastic body The excitation frequency of the vibration source body and the mass of the outer pipe pile The calculation settings and formula are as follows:

[0012]

[0013] The connection stiffness value of the internal elastic body The damping value c is determined by the mass of the inner vibration-absorbing pile. and the quality of the outer pipe pile and the stiffness value of the external elastic body The calculation settings and formula are as follows:

[0014]

[0015]

[0016]

[0017] Preferably, the outer layer pipe pile and the inner layer vibration-absorbing pile are arranged concentrically and coaxially.

[0018] Preferably, the outer contours of both the outer pipe pile and the inner vibration-absorbing pile are circular, the inner contour of the outer pipe pile is also circular, and the wall thickness of the outer pipe pile is equal at different positions along its circumference.

[0019] Preferably, the outer layer pipe pile and the inner layer vibration-absorbing pile have the same vertical height and the same elevation.

[0020] Preferably, the external elastic body is a structure formed by injecting polyurethane vibration damping material between the outer layer pipe pile and the front support of the soil and rock mass and between the outer layer pipe pile and the rear support of the soil and rock mass, wherein the polyurethane vibration damping material is densely filled between the outer layer pipe pile and the front support of the soil and rock mass and between the outer layer pipe pile and the rear support of the soil and rock mass.

[0021] Preferably, the internal elastic body is a structure formed by injecting polyurethane vibration damping material into all or part of the area between the outer wall of the inner layer vibration-absorbing pile and the inner wall of the outer layer pipe pile, and the polyurethane vibration damping material fills the area between the outer wall of the inner layer vibration-absorbing pile and the inner wall of the outer layer pipe pile densely.

[0022] Preferably, the outer layer pipe pile and the inner layer vibration-absorbing pile are reinforced concrete structures or steel structures, and the inner layer vibration-absorbing pile is a solid structure or a hollow structure.

[0023] Preferably, based on the vibration propagation range of the fixed-frequency vibration generated by the vibration source, the dynamic vibration absorption unit piles for fixed-frequency vibration isolation are arranged in parallel and periodically in the propagation path between the vibration source and the vibration-sensitive target.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] Since the vibration sources generated by industrial machinery and equipment are generally low-frequency, strong-pulse, fixed-frequency vibrations, a dynamic vibration-absorbing unit pile of the present invention is used on the path of the vibration source body's vibration transmitted to the vibration-sensitive target being protected. The outer layer pipe pile connected by an external elastic body absorbs the fixed-frequency vibration generated by the vibration source body to generate resonance, and the inner layer vibration-absorbing pile is connected to the inner layer pipe pile through an internal elastic body. Based on the principle of dynamic vibration absorption, the dynamic vibration absorption system composed of the internal elastic body and the inner layer vibration-absorbing pile absorbs the resonance energy generated by the outer pipe pile. It can effectively absorb the fixed-frequency vibration energy transmitted from the vibration source body on the vibration transmission path, thereby achieving the purpose of effective vibration isolation. Attached Figure Description

[0026] Figure 1 This is a schematic elevation view of a dynamic vibration-absorbing unit pile used for fixed-frequency vibration isolation between the vibration source and the vibration-sensitive target.

[0027] Figure 2 This is a plan view of a dynamic vibration-absorbing unit pile used for fixed-frequency vibration isolation;

[0028] Figure 3 This is a schematic diagram of a parallel, periodically continuous arrangement of dynamic vibration-absorbing unit piles used for fixed-frequency vibration isolation.

[0029] The markings in the diagram are: 1. External elastic body; 2. Outer layer pipe pile; 3. Internal elastic body; 4. Inner layer vibration-absorbing pile; 5. Front support body of the rock and soil mass; 6. Rear support body of the rock and soil mass; 11. Vibration source body; 12. Vibration-sensitive target. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0031] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0032] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0033] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0034] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0035] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0036] Example 1

[0037] like Figures 1-3 As shown, this embodiment provides a dynamic vibration absorption unit pile for fixed-frequency vibration isolation, including a front support body 5 of the soil and rock mass, a rear support body 6 of the soil and rock mass, a vibration resonance amplification system, and a dynamic vibration absorption system.

[0038] The front support body 5 of the soil and rock mass is set between the vibration source body 11 and the vibration sensitive target 12 and is vertically set in the soil and rock mass on the side closer to the vibration source body 11; the rear support body 6 of the soil and rock mass is set between the vibration source body 11 and the vibration sensitive target 12 and is vertically set in the soil and rock mass on the side closer to the vibration sensitive target 12. The rear support body 6 of the soil and rock mass and the front support body 5 of the soil and rock mass are set opposite to each other, which can ensure the horizontal consistency of vibration energy transmission.

[0039] The vibration resonance amplification system includes an outer elastic body 1 and an outer pipe pile 2. The height, outer diameter, inner diameter, and material of the outer pipe pile 2 are adjustable, as are the material and material parameters of the outer elastic body 1. The outer pipe pile 2 and the inner vibration-absorbing pile 4 are reinforced concrete or steel structures, and their materials can be selected. Reinforced concrete structures are preferred due to their lower cost.

[0040] The outer layer pipe pile 2 is disposed between the front support body 5 and the rear support body 6 of the soil and rock mass. The outer elastic body 1 is disposed between the outer layer pipe pile 2 and the front support body 5 of the soil and rock mass, and between the outer layer pipe pile 2 and the rear support body 6 of the soil and rock mass, so that the outer layer pipe pile 2 is connected to the front support body 5 and the rear support body 6 of the soil and rock mass by the outer elastic body 1. If the outer elastic body 1 is an adhesive material, the outer elastic body 1 can bond the outer layer pipe pile 2 to the front support body 5 and the rear support body 6 of the soil and rock mass. In an optional embodiment, the outer elastic body 1 is a structure formed by injecting polyurethane vibration damping material between the outer layer pipe pile 2 and the front support body 5 of the soil and rock mass, and between the outer layer pipe pile 2 and the rear support body 6 of the soil and rock mass. The polyurethane vibration damping material fills the space between the outer layer pipe pile 2 and the front support body 5 of the soil and rock mass, and between the outer layer pipe pile 2 and the rear support body 6 of the soil and rock mass densely, forming an adhesive bond.

[0041] The dynamic vibration absorption system includes an inner elastic body 3 and an inner layer vibration-absorbing pile 4. The inner layer vibration-absorbing pile 4 is a solid or hollow structure. The inner diameter and material of the inner layer vibration-absorbing pile 4 can be adjusted. When the inner diameter is 0, the inner layer vibration-absorbing pile is a solid pile. It is designed according to the required energy absorption and is a reinforced concrete structure or a steel structure, etc. The material can be selected, with reinforced concrete being preferred due to its lower cost. The inner layer vibration-absorbing pile 4 is set inside the outer layer pipe pile 2. As a preferred embodiment, the outer layer pipe pile 2 and the inner layer vibration-absorbing pile 4 are arranged concentrically and coaxially, which can ensure the balance of force in all directions and achieve better vibration isolation effect.

[0042] In an optional embodiment, the cross-sectional shapes of the outer pipe pile 2 and the inner vibration-absorbing pile 4 can be selected, as long as the inner vibration-absorbing pile 4 is located inside the outer pipe pile 2. As a preferred embodiment, the outer contours of both the outer pipe pile 2 and the inner vibration-absorbing pile 4 are circular, and the inner contour of the outer pipe pile 2 is also circular. The wall thickness of the outer pipe pile 2 is equal at different circumferential positions, ensuring the balance of force in all directions and resulting in better vibration isolation.

[0043] The inner elastic body 3 is disposed between the outer wall of the inner vibration-absorbing pile 4 and the inner wall of the outer pipe pile 2. The inner elastic body 3 is connected to both the outer wall of the inner vibration-absorbing pile 4 and the inner wall of the outer pipe pile 2, so that the inner vibration-absorbing pile 4 and the outer pipe pile 2 are connected by the inner elastic body 3. The arrangement area, size, material, and material parameters of the inner elastic body 3 can be adjusted to ensure that the inner elastic body can effectively connect the inner wall of the outer pipe pile 2 and the outer wall of the inner vibration-absorbing pile 4. In an optional embodiment, the inner elastic body 3 is an adhesive structure that can be bonded to the outer side of the inner vibration-absorbing pile 4 and to the inner wall of the outer pipe pile 2. The inner elastic body 3 is a structure formed by injecting polyurethane vibration-damping material into all or part of the area between the outer wall of the inner vibration-absorbing pile 4 and the inner wall of the outer pipe pile 2. The polyurethane vibration-damping material fills the area between the outer wall of the inner vibration-absorbing pile 4 and the inner wall of the outer pipe pile 2 densely, forming an adhesive bond. The area for injecting polyurethane damping material is selected based on the stiffness of the internal elastomer 3, preferably with a circumferentially even distribution. The injection range is adjusted by placing a mold, and the injection area must be densely filled.

[0044] The fixed-frequency vibration generated by the vibration source 11 can be transmitted to the outer elastic body 1 through the front support body 5 of the rock and soil body, causing the outer elastic body 1 to cause the outer pipe pile 2 to resonate. The vibration generated by the resonance of the outer pipe pile 2 compresses the inner elastic body 3, causing the inner elastic body 3 to deform and dissipate energy, and then transmits the remaining energy after energy dissipation to the inner vibration-absorbing pile 4 for absorption.

[0045] The vertical heights of the outer layer pipe pile 2 and the inner layer vibration-absorbing pile 4 can be selected, but as a preferred option, the vertical height of the inner layer vibration-absorbing pile 4 should be greater than or equal to the vertical height of the outer layer pipe pile 2. Furthermore, the top and bottom elevations of the inner layer vibration-absorbing pile 4 should cover the top and bottom elevations of the outer layer pipe pile 2. The top and bottom elevations should be selected based on the vertical range of the vibration propagation from the vibration source 11. This allows for more comprehensive isolation of the vibration propagation from the vibration source 11, resulting in better vibration isolation. More preferably, the outer layer pipe pile 2 and the inner layer vibration-absorbing pile 4 have the same vertical height and elevation, i.e., the same top and bottom elevations. This ensures more comprehensive isolation of the vibration propagation from the vibration source 11 while avoiding excessively large pile heights and depths, reducing the amount of construction work and construction costs.

[0046] In a preferred embodiment, the mass ratio of the inner vibration-absorbing pile 4 to the outer pipe pile 2 is... Less than or equal to 1 means that vibration can be controlled with a structure of smaller or equal mass.

[0047] The stiffness value of the external elastic body 1 The excitation frequency of the vibration source body 11 and the mass of the outer pipe pile 2 The connection stiffness value of the internal elastic body 3 is calculated and set. The damping value c is determined by the mass of the inner vibration-absorbing pile 4. and the mass of the outer pipe pile 2 and the stiffness value of the external elastic body 1 Calculation settings.

[0048] Since the vibration excitation generated by the vibration source 11 is of constant frequency, it is assumed to be... (Unit: Hz), assuming the mass of the outer pipe pile 2 is... (Unit: kg) The outer diameter can be set by the outer layer pipe pile 2. (Unit: m) Inner diameter (Unit: m), Height H (unit: m), Material density 1 (unit: kg / m³) 3 The stiffness value of the external elastic body 1 that causes the resonance of the outer pipe pile 2 can be calculated using the natural frequency formula of a single-degree-of-freedom undamped system. (Unit: N / m) is:

[0049]

[0050] The connection stiffness value of the internal elastic body 3 is determined according to the classic design formula of the dynamic vibration absorber. The damping value (in N / m) and damping value c (in N•s / m) are shown in the following formulas:

[0051]

[0052]

[0053]

[0054] in, The mass of the inner vibration-absorbing pile 4 is expressed in kg. The outer diameter can be set by the inner layer vibration-absorbing pile 4. (Unit: m) Inner diameter (Unit: m), Height H (unit: m), Material density 2 (unit: kg / m³) 3 It is calculated using ). The mass ratio of the inner layer vibration-absorbing pile 4 to the outer layer pipe pile 2.

[0055] The outer pipe pile 2 and the outer elastic body 1 form a vibration resonance amplification system, which is used to amplify the fixed-frequency vibration transmitted by the vibration source body 11. Its specific parameters can be reasonably matched and designed by the excitation frequency of the vibration source body 11 and the mass of the outer pipe pile 2. The inner vibration-absorbing pile 4 and the inner elastic body 3 form a dynamic vibration absorption system based on the resonance system of the outer pipe pile 2. Its specific dynamic parameter characteristics can be reasonably matched and designed by the dynamic parameters of the outer pipe pile 2.

[0056] Since the vibration sources generated by industrial machinery and equipment are generally fixed-frequency low-frequency vibrations, the fixed-frequency vibration-absorbing unit piles described in this invention are used on the path of vibration transmission to the protected target. The outer layer pipe piles connected by the outer elastic body absorb the fixed-frequency vibration generated by the vibration source body to generate resonance. The inner layer vibration-absorbing piles are connected to the inner layer pipe piles by the inner elastic body. Based on the principle of dynamic vibration absorption, the resonance energy generated by the outer pipe piles is absorbed by the dynamic vibration absorption system composed of the inner elastic body and the inner layer vibration-absorbing piles. When the vibration source 11 generates a fixed-frequency vibration excitation and propagates through the soil and rock to the vibration-sensitive target 12, a dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation as described in this invention is set up along the propagation path. First, the outer elastic body 1 with reasonable parameters induces resonance in the outer pipe pile 2. Then, the inner elastic body 3 with reasonable parameters adopts the dynamic vibration absorption principle, and the inner vibration-absorbing pile 4 absorbs the resonance energy of the outer pipe pile 2, thereby achieving fixed-frequency vibration isolation. That is, by selecting reasonable outer pipe pile mass, inner vibration-absorbing pile mass, outer elastic body stiffness and damping parameters, and inner elastic body stiffness and damping parameters, the fixed-frequency vibration propagated from the vibration source can be effectively absorbed along the vibration transmission path, thereby achieving the purpose of effective vibration isolation. The present invention utilizes a dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation, which effectively achieves low-frequency fixed-frequency vibration isolation and solves the difficulties of current periodic vibration isolation piles and vibration isolation trenches in isolating low-frequency vibration. It reduces the vibration impact of low-frequency vibration of the vibration source on the protected target. Its structure is simple and practical, construction is convenient and quick, and vibration reduction effect is excellent, solving the vibration impact of large industrial machinery on surrounding buildings or other sensitive targets.

[0057] Example 2

[0058] The dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation described in this invention differs from Embodiment 1 in that, in order to achieve a wider range of vibration isolation, the dynamic vibration-absorbing unit piles for fixed-frequency vibration isolation described in this invention are arranged in parallel, periodically, and continuously perpendicular to the vibration transmission path direction, such as... Figure 3 As shown.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation, characterized in that, include: The rock and soil front support (5) is set between the vibration source body (11) and the vibration sensitive target (12) and is vertically set in the rock and soil on the side close to the vibration source body (11); The rear support body (6) of the rock and soil body is set between the vibration source body (11) and the vibration sensitive target (12) and is vertically set in the rock and soil body on the side close to the vibration sensitive target (12). The rear support body (6) of the rock and soil body and the front support body (5) of the rock and soil body are set opposite to each other. The vibration resonance amplification system includes an external elastic body (1) and an outer pipe pile (2). The outer pipe pile (2) is disposed between the front support body (5) and the rear support body (6) of the soil and rock mass. The external elastic body (1) is disposed between the outer pipe pile (2) and the front support body (5) of the soil and rock mass and between the outer pipe pile (2) and the rear support body (6) of the soil and rock mass. The vibration resonance amplification system is used to amplify the fixed frequency vibration transmitted by the vibration source body (11). The dynamic vibration absorption system includes an inner elastic body (3) and an inner layer vibration absorption pile (4). The inner layer vibration absorption pile (4) is disposed inside the outer layer pipe pile (2). The inner elastic body (3) is disposed between the outer wall of the inner layer vibration absorption pile (4) and the inner wall of the outer layer pipe pile (2). The inner elastic body (3) is connected to both the outer wall of the inner layer vibration absorption pile (4) and the inner wall of the outer layer pipe pile (2). The fixed-frequency vibration generated by the vibration source (11) can be transmitted to the outer elastic body (1) through the rock and soil front support (5), causing the outer elastic body (1) to cause the outer pipe pile (2) to resonate. The vibration generated by the resonance of the outer pipe pile (2) compresses the inner elastic body (3), causing the inner elastic body (3) to deform and dissipate energy, and then transmits the remaining energy to the inner vibration-absorbing pile (4) for absorption; the mass ratio of the inner vibration-absorbing pile (4) to the outer pipe pile (2) is... Less than or equal to 1; the stiffness value of the external elastic body (1) The excitation frequency of the vibration source body (11) and the mass of the outer pipe pile (2) The calculation settings and formula are as follows: The connection stiffness value of the internal elastic body (3) The damping value c is determined by the mass of the inner vibration-absorbing pile (4). and the mass of the outer pipe pile (2) and the stiffness value of the external elastic body (1) The calculation settings and formula are as follows: 。 2. The dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation according to claim 1, characterized in that, The outer layer pipe pile (2) and the inner layer vibration-absorbing pile (4) are arranged concentrically and coaxially.

3. A dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation according to claim 2, characterized in that, The outer contours of the outer pipe pile (2) and the inner vibration-absorbing pile (4) are both circular, and the inner contour of the outer pipe pile (2) is also circular. The wall thickness of the outer pipe pile (2) is equal at different positions in the circumference.

4. A dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation according to claim 1, characterized in that, The outer layer pipe pile (2) and the inner layer vibration-absorbing pile (4) have the same vertical height and the same elevation.

5. A dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation according to claim 1, characterized in that, The external elastic body (1) is a structure formed by injecting polyurethane vibration damping material between the outer layer pipe pile (2) and the front support body (5) of the soil and rock mass and between the outer layer pipe pile (2) and the rear support body (6) of the soil and rock mass. The polyurethane vibration damping material is densely filled between the outer layer pipe pile (2) and the front support body (5) of the soil and rock mass and between the outer layer pipe pile (2) and the rear support body (6) of the soil and rock mass.

6. A dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation according to claim 1, characterized in that, The inner elastic body (3) is a structure formed by injecting polyurethane vibration damping material into all or part of the area between the outer wall of the inner layer vibration-absorbing pile (4) and the inner wall of the outer layer pipe pile (2). The polyurethane vibration damping material fills the area between the outer wall of the inner layer vibration-absorbing pile (4) and the inner wall of the outer layer pipe pile (2) densely.

7. A dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation according to claim 1, characterized in that, The outer layer pipe pile (2) and the inner layer vibration-absorbing pile (4) are reinforced concrete structures or steel structures, and the inner layer vibration-absorbing pile (4) is a solid structure or a hollow structure.

8. A dynamic vibration-absorbing unit pile for fixed-frequency vibration isolation according to any one of claims 1-7, characterized in that, According to the vibration propagation range of the fixed-frequency vibration generated by the vibration source (11), the dynamic vibration absorption unit pile for fixed-frequency vibration isolation is arranged in parallel periodically and continuously in the propagation path between the vibration source (11) and the vibration sensitive target (12).

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